Finding the sum of sequence

Submitted by Marvins Daniel on April 21, 2018 - 12:23am
how will i use calculator to solve this
The sum of 5th term of Ap is 10,
The sum of 10th term of Ap is 20
Find the common diff,first term
sum of 26th term
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The sum of 5th term of Ap is
Do you mean "sum of the first 5 terms"?
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